Propagation issue

Hello,

This is a propagation issue rather than a Med-gardening subject.
I have a small collection of unusual trees, mostly maples (yes, I am one of those crazy collectors). Recently I purchased a few aditions and, even though they are the straight species (Acer maximowiczii, Acer pentaphyllum and Acer pauciflorum), they are grafted onto A. pensylvanicum, A. pseudoplatanus and A. palmatum respectively. I understand this is a common procedure with rare trees of which viable seed is hardly available and it also ensures you propagate the true species and not something hybrid if the seed is garden collected. I don't mind grafted plants if it is a cultivar, but I particularly don't like grafted plants in the case of straight species because then it seems it is only "half a plant". In situations when the rootstock has a very different bark color and texture than that of the scion, it makes for an ugly graft and the tree does not have its natural flair right above the ground.
So, does anybody know what are the chances for the scion to produce roots of its own if I plant the grafted plant deeper into the soil so the graft is underground? I know this is a horticultural aberration, for a plant needs to be planted at the right depth, but I have seen grafted fruit trees planted too deep get roots of their own above the graft and live healthy and happy for a long time. Besides, my soil is fairly good and I think the plant won't be any hardier grafted than on its own roots.
On the other hand, what are the chances for rooting with hormones sofwood cuttings to be taken this June? 

Thank you for your help.

Fran
Madrid, Spain
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